Submission #891117


Source Code Expand

# include <stdio.h>
# include <bits/stdc++.h>
using namespace std;
# define fi cin
# define fo cout
# define x first
# define y second
# define ll long long
# define IOS ios_base :: sync_with_stdio(0);cin.tie(0)
# define p(v) cerr << #v << " = " << v << '\n'
# define p2(v) cerr << #v << " = " << (complex < int > (v.x,v.y)) << '\n'
# define vi vector < int >
# define vll vector < ll >
# define pii pair < int , int >
//# pragma GCC target ("sse4")
int main(void)
{
    #ifdef CF
    freopen("input","r",stdin);
    #endif // CF
    srand(time(0));
    fo << fixed << setprecision(7);
    cerr << fixed << setprecision(7);
    int n;
    fi>>n;
    static int p[1 << 20];
    for (int i = 1;i <= n;++i)
        fi>>p[i];
    int ans = 0;
    for (int i = 1;i <= n;++i)
        ans += p[p[i]] == i;
    fo << ans / 2 << '\n';
    return 0;
}

Submission Info

Submission Time
Task B - Friendly Rabbits
User reality
Language C++14 (GCC 5.4.1)
Score 200
Code Size 874 Byte
Status AC
Exec Time 35 ms
Memory 640 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 200 / 200
Status
AC × 3
AC × 15
Set Name Test Cases
Sample 0_00.txt, 0_01.txt, 0_02.txt
All 0_00.txt, 0_01.txt, 0_02.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt
Case Name Status Exec Time Memory
0_00.txt AC 2 ms 256 KB
0_01.txt AC 2 ms 256 KB
0_02.txt AC 3 ms 256 KB
1_00.txt AC 3 ms 256 KB
1_01.txt AC 34 ms 640 KB
1_02.txt AC 35 ms 640 KB
1_03.txt AC 34 ms 640 KB
1_04.txt AC 35 ms 640 KB
1_05.txt AC 34 ms 640 KB
1_06.txt AC 35 ms 640 KB
1_07.txt AC 35 ms 640 KB
1_08.txt AC 14 ms 384 KB
1_09.txt AC 29 ms 512 KB
1_10.txt AC 25 ms 512 KB
1_11.txt AC 8 ms 256 KB